PRODUCTION OF POLYPHOSPHORIC ACID ESTER

• Main Authors: NARITA KENSHO, TAKEBAYASHI TAKASHI, FUJISHITA YUICHI
• Format: Patent
• Language: English
• Published: 17.10.2000
• Edition: 7
• Subjects: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM; CHEMISTRY; COMPOSITIONS BASED THEREON; METALLURGY; ORGANIC CHEMISTRY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

PROBLEM TO BE SOLVED: To provide a method for simply producing a polyphosphoric acid ester having high heat stability and low volatility, and having a high phosphor content so that the ester can give sufficient flame-resisting properties to a synthetic resin, even when added in a small amount. SOLUTION: This method for producing a polyphosphoric acid ester comprises reacting 3,9-dichloro-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5,5]undecane-3,9-dio xide with a diol expressed by the formula: HO-R-OH (R is a 2-8C alkylene or a 6-20C arylene) in an amount of 2.5 to 5 mol per mol of the above compound in an organic solvent, then further adding the 3,9-dichloro-2,4,8,10-tetraoxa-3,9- diphosphaspiro[5,5]undecane-3,9-dioxide to the reaction mixture in an amount of 1-4 times the amount that is added at the first time, and finally subjecting the reaction product to condensation polymerization reaction at a temp. of 90-150 deg.C to form the polyphosphoric acid ester of the formula [R is a 2-8C alkylene or a 6-20C arylene; (n) is 1.8 to 6].